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NamespaceHandler [message #766353]

Thu, 15 December 2011 15:50

Frederic Boucher

Messages: 3
Registered: December 2011

Junior Member

Hello,

I got some troubles with the NamespaceHandler management in spring-dm and virgo. I explained my problem here: http ://www.eclipse.org/forums/index.php/t/265692/

When spring-dm refresh a spring bundle, it use a DelegateNamespaceHandlerResolver composed of:
- a "local NamespaceHandlerResolver" that use the ClassLoader of the bundle to find the spring.handlers file;
- a "OSGI service NamespaceHandlerResolver" that use an osgi service to find the NamespaceHandler;

In a first time, I thought that my issue come from the "OSGI service NamespaceHandlerResolver" (http ://www.eclipse.org/forums/index.php/t/265692/).

But I found this code in the class MetaInfResourceClassLoaderDelegateHook from the Virgo code source:

    private boolean isDelegatedResolverCall() {
        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
        return isSpringDmDelegatedResolverCall(stackTrace) || isBlueprintDelegatedResolverCall(stackTrace);
    }
    
    private boolean isSpringDmDelegatedResolverCall(StackTraceElement[] stackTrace) {
        return isDelegatedResolverCall(stackTrace, SPRINGDM_DELEGATED_NAMESPACE_HANDLER_RESOLVER_CLASS_NAME, SPRINGDM_DELEGATED_ENTITY_RESOLVER_CLASS_NAME);
    }
    
    private boolean isBlueprintDelegatedResolverCall(StackTraceElement[] stackTrace) {
        return isDelegatedResolverCall(stackTrace, BLUEPRINT_DELEGATED_NAMESPACE_HANDLER_RESOLVER_CLASS_NAME, BLUEPRINT_DELEGATED_ENTITY_RESOLVER_CLASS_NAME);
    }

It seems that this code is here to avoid to use the "local NamespaceHandlerResolver" when loading the bean definitions using Spring-Dm but I don't understand why ?

regards,
Frederic

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Re: NamespaceHandler [message #766701 is a reply to message #766353]

Fri, 16 December 2011 09:30

Glyn Normington

Messages: 1222
Registered: July 2009

Senior Member

The purpose of MetaInfResourceClassLoaderDelegateHook is to propagate an attempt to get resource(s) from META-INF to the principle bundle's dependencies, but this is not done if the request is being driven through Spring DM's DelgatedNamespaceHandlerResolver as it would not be appropriate to get namespace handlers directly from a bundle's dependencies. This logic should not affect the behaviour of the local namespace handler resolver as that only depends on looking up resources in a bundle's own META-INF.

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